Drug interactions
Clozapine + Trospium
Severity: Major
Clozapine and Trospium: major interaction.
Last updated
For healthcare professionals — reference only. This page is a brief summary, not medical advice and not a substitute for official labeling or clinical judgement. Always verify before prescribing or dispensing.
Summary
Clozapine has marked anticholinergic activity and already causes constipation and urinary problems; adding trospium increases this burden. Severe constipation and ileus are a particular concern with clozapine, and confusion or tachycardia can also occur.
What this interaction means in plain words
Clozapine and Trospium can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for.
Clozapine belongs to Central Nervous System; Trospium belongs to Genitourinary.
Why it happens
Additive antimuscarinic effects on gut, bladder and central nervous system.
What to do
Avoid the combination where possible, or monitor bowel function closely and use a laxative strategy. Stop trospium if constipation worsens or urinary retention, delirium or abdominal distension develops.
What to ask your pharmacist
- Does the benefit of taking both outweigh the risk in my case?
- Do I need any blood test, ECG or other check while on both?
- What early warning signs should I watch for, and what should I do if they appear?
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Other interactions of Trospium
- Pramlintide + Trospium Major
- Thioridazine + Trospium Major
- Trihexyphenidyl + Trospium Major
- Aclidinium + Trospium Moderate
- Amantadine + Trospium Moderate
- Amitriptyline + Trospium Moderate
Other interactions of Clozapine
- Clozapine + Deferiprone Contraindicated
- Clozapine + Irinotecan Contraindicated
- Clozapine + Pimozide Contraindicated
- Clozapine + Thioridazine Contraindicated
- Acalabrutinib + Clozapine Major
- Adagrasib + Clozapine Major
Frequently asked questions
Can I take Clozapine with Trospium?
MediHelp rates the interaction as major. Clozapine and Trospium can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for. Clozapine has marked anticholinergic activity and already causes constipation and urinary problems; adding trospium increases this burden. Severe constipation and ileus are a particular concern with clozapine, and confusion or tachycardia can also occur.
How serious is the interaction between Clozapine and Trospium?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid the combination where possible, or monitor bowel function closely and use a laxative strategy. Stop trospium if constipation worsens or urinary retention, delirium or abdominal distension develops.
What other medicines interact with Trospium?
MediHelp also lists interactions of Trospium with, for example, Pramlintide, Thioridazine, Trihexyphenidyl. The full list is on the Trospium page.
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